AC Infinity Controller 69 Guide: Setup, Triggers & Limits
Short answer: connect the sensor and fan, select the correct port, set a minimum speed that protects baseline air exchange, set a safe maximum, then add temperature or humidity triggers gradually. Test the completed program with the tent closed before trusting it around plants.
Video chapters
- 0:00 — App and controller generation
- 0:07 — Pair the controller
- 0:25 — Read temperature and humidity
- 0:40 — Minimum fan speed
- 1:08 — Maximum fan speed
- 1:29 — Historical temperature trigger
- 2:16 — Calibration and transition setting
- 2:52 — How the speed ramp works
- 3:54 — Return to the active program
Timestamp links open the standard HWGrow pop-out player at the selected moment without losing your reading position.
1. Identify the controller and connector first
The current Controller 69 family uses AC Infinity’s UIS ecosystem, while some previous-generation fans and controllers used Molex connections and may need an approved adapter. The manufacturer’s current controller comparison separates the 69, 69 Pro, 69 Pro+ and AI+ by ports, app connection and available automation.
The current 69 Pro is a four-port UIS controller with temperature, humidity and VPD sensing plus Bluetooth or 2.4 GHz Wi-Fi. The standard current 69 is Bluetooth-only. Confirm the label on the controller—not the appearance of the screen—before following app instructions.
2. Place and verify the sensor
- Hang the probe near canopy height in moving air.
- Keep it out of direct light, leaf contact, humidifier mist and the exhaust stream.
- Compare it with a second trusted temperature/RH sensor before programming tight limits.
- Use the controller’s calibration setting only after the comparison is stable.
3. Set minimum and maximum levels
The minimum level is the slowest speed the fan can use while the selected program is active; the maximum caps how hard it can run. A minimum of zero may allow the fan to stop completely. That can be fine in a tested empty tent, but occupied tents often need continuous air exchange, odor control and humidity management.
Start low, close the tent and confirm that the walls pull inward slightly without collapsing. Then raise the maximum only as far as needed to control the real room. More speed also means more noise, stronger negative pressure and faster loss of conditioned air.
4. Choose triggers from measurements—not plant-week presets
The 78°F value in the original video was my room-specific starting point, not a universal best temperature. Cultivar, light intensity, leaf temperature, humidity, CO2 strategy and equipment location all matter. Humidity triggers are not “useless”; they can be essential when condensation or late-flower moisture is the limiting risk.
Set one trigger, watch a full light-on and light-off cycle, then add the next. If temperature and humidity triggers compete, change the device assignment, minimum level, transition or buffer rather than assuming one sensor should be ignored.
5. Use transition and buffer settings to stop fan hunting
A transition setting ramps the device as conditions move farther from the target. The current 69 Pro supports dynamic transitions, while buffer options differ by controller. A wider transition or buffer can reduce rapid speed changes, but too wide a setting may let the room drift. The manufacturer’s current Controller 69 Pro programming guide should be the final authority for the active model.
For the physical installation, use the grow-tent fan and filter guide. Before replacing older equipment, read the state of indoor grow equipment so a familiar model name does not hide a changed specification.
Current controller and ventilation options
Controller 69 ProVerify the current CTR69P model, port count, connectivity and device compatibility.Check Current OptionsCompatible inline fanMatch fan size to the filter, duct, tent volume and static-pressure loss.Check Current OptionsIndependent temp/RH sensorUse a second meter to check probe placement and calibration before tightening automation.Check Current Options
AC Infinity savings: Use code EVYGROWS for additional savings on eligible products. When shopping on Amazon, clip any available coupon first.
Affiliate disclosure: HWGrow may earn a commission from qualifying Amazon purchases at no additional cost to you. Product generations can change, so verify the current model and compatibility before ordering.
Need help translating the controller options to your exact tent? Ask HWGrow with the controller model, fan model, tent dimensions and a screenshot of the current program.
Frequently asked questions
Is 78°F the best controller setting for every grow tent?
No. It was a historical starting point in one room. Choose triggers from actual leaf/canopy conditions, humidity, light, cultivar and equipment behavior.
Should the exhaust fan ever turn completely off?
Only after testing confirms the tent can safely maintain air exchange, humidity and odor control. Many occupied tents benefit from a nonzero minimum speed.
Are Controller 67 and Controller 69 instructions interchangeable?
No. Connector type, app connection and available programs differ by generation and model. Confirm the label and current manual.
Why does the fan keep speeding up and slowing down?
The trigger may be too close to normal fluctuations or the transition/buffer may be too narrow. Check sensor placement and competing temperature/humidity triggers before changing the fan.
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Hey,
Just have to thank you for your needed tutorial on the Controller 69 programming. What a fine product AC Infinity puts out, save one thing…their programming guide is very descriptive in the most complicated way possible. Without your guidance I might have given up and just used a dumb timer. Thank you, thank you!
Best Wishes,
Kath
I thought the same thing and that’s why I made the video to save other people the misery of trying to read their instructions which made 0 sense
Just a question wouldn’t it be better to set a max humidity for in flower since you want to keep it under 50 Rh?
It depends what the extremes are but yes. Humidity is extremely important
I’m an old guy in my 60’s trying to setup the AC Infinity Controller 69, I’ve got White Widow Auto’s that I got from ILGM which was the beginners mix. I germinated two seeds and put them straight into the fabric pots and into the tent. I was just wondering what settings do I need right from the start since the seeds haven’t broken ground yet or do I just run the light until they break ground? I’ll use your settings for veg and flower but what should I start with? Thanks for your help and thanks for the information you have already given.
It really depends on temps. If you could keep it at a constant 78 degrees. I would just set it at 1 at week 1, 2 at week 2, and cap out at like 8 at week and, no real need to go all the way to 10
should update this for the cloudforge humidifier and trying to target vpds and stuff
Sorry but as explained in my how to pick a humidifier video, a transparent rez is a big no no. I do not endorse that model. They are already working on a new one based on my feedback
Yeah they MUST fix the humidifier..what were they thinking making it transparent
no idea why they keep trying to do what other companies have been specializing for years.
my controller is a number 6 when I try to change the mode a lock symbol appears in upper left corner and i can not get fan to turn on
Holding the setting button will lock the controller in your current mode. While your controller is locked, no parameters may be adjusted, nor will you be able to switch modes. Holding the setting button again will unlock the controller.
Whats up? Was just wondering what would be you target humidity and temperature lights on and lights off flowing stafe? when do I start dropping temps to get the purple and what temp would I have to drop to for it to shock the plants? Thank you
depends on what Im doing, if I want colorful leaves, drop temps 10 degrees starting week 7 in bloom, humidity never goes above 50% in my tents anytime after week 4 in bloom.